I have read that kunekune pigs should not be given dairy and have tried to find out why not. Specifically milk, goats milk. Does anyone know why and what effect it would have on them.
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They love it and do well from it. I know a couple of people who feed their own left over goats milk.
But you need to check you are legal.

Current legislation also imposes strict controls banning the feeding of other
materials of animal origin or products containing them to farmed animals.
There are however a small number of exceptions to this, and the following
materials may be fed to pigs:
• Liquid milk or colostrum may be fed to pigs kept on the same holding
as that on which the milk or colostrum originated
• Milk, milk products and white water when suitably treated.

Please note that anyone obtaining waste milk, milk products or white water to feed to their pigs would need to register with Defra for this purpose, although, in the case of milk products, this would only be necessary it they contained more than 80% milk.

I had to hand rear a piglet recently as she had an eye removed.
Full cream goats milk was recommended as a subsitute for her mothers milk and she thrived on it.
Jemima is now a happy healthy one eyed pig!
They love it.